Firefox - Toolbox

The Toolbox provides a single home for most of the developer tools that are built into Firefox. You can open it by selecting "Toggle Tools" from the Web Developer menu (under "Tools" on OS X and Linux, or "Firefox" on Windows), or by activating any tool hosted in it (for example, the JavaScript Debugger or the Page Inspector).

By default, the window appears docked to the bottom side of the Firefox window, but you can detach it if you like. This is what it looks like when it's docked:

The window itself is split into two parts: a toolbar along the top, and a main pane underneath:

Toolbar

The toolbar contains controls to activate a particular tool, to dock/float the window, and to close the window:

On the far left is a row of buttons to:

close the window

toggle the window between attached to the bottom of the browser window, and attached to the side of the browser window

toggle the window between standalone and attached to the browser window

Note that not all the hosted tools are always listed here: only the tools actually available in this context are shown (for example, not all tools support remote debugging yet, so if the debugging target is not the Firefox instance that launched the window, not all the hosted tools will be shown).

Next there's "Select element": this button was moved into the Toolbox toolbar from the Page Inspector in Firefox 29. If you click this button, then as you move around the web page you'll see a dotted border around each element. Click the element, and the Page Inspector will open with that element selected.

Next there's a button to activate and deactivate the split console. This enables you to use the web console without switching away from the tool you currently have active. This button's only available from Firefox 28 onwards.

Finally, the icons at the far right enable you to launch various tools whose user interfaces are not hosted by the Toolbox: